Waste Management,
Journal Year:
2023,
Volume and Issue:
170, P. 62 - 74
Published: Aug. 5, 2023
Volatile
fatty
acids
(VFAs)
supplementation
in
ruminants'
diet
as
a
source
of
energy
and
chemical
precursors
their
effect
on
animal's
physiology
well-being
has
long
been
scientific
interest.
Production
VFAs
through
anaerobic
digestion
agro-industrial
residues
not
only
creates
value
but
also
presents
an
alternative
sustainable
approach
for
ruminant
feed
supplementation.
Therefore,
this
study
aimed
to
investigate
the
bioconversion
produced
large
quantities
such
apple
pomace
(AP),
thin
stillage
(Ts),
potato
protein
liquor
(PPL)
VFAs,
fully
complying
regulations
set
supplement
production.
In
regard,
batch
acidogenic
fermentation
assays
(pH
6-10)
semi-continuous
immersed
membrane
bioreactor
(iMBR)
were
applied.
assays,
at
pH
10
co-digestion
Ts
PPL
highest
concentration
(14.2
g/L),
indicating
yield
0.85
g
CODVFAs/g
volatile
solids
(VS)added.
The
optimum
condition
was
then
applied
iMBR
situ
recovery
different
organic
loading
rates
(OLR).
With
increasing
OLR
3.7
gVS/L.day,
28.6
g/L
(1,2
CODVFAs
/gVSadded)
achieved.
Successful
long-term
(114
days)
filtration
conducted
media
with
maximum
40
total
(TS),
facing
irreversible
fouling
final
stages.
Acidogenic
using
potential
play
important
role
future
additive
provision
biorefining
wastes
via
carboxylate
platform,
given
production
from
residues.
Journal of Environmental Management,
Journal Year:
2022,
Volume and Issue:
319, P. 115700 - 115700
Published: July 20, 2022
Volatile
fatty
acids,
intermediate
products
of
anaerobic
digestion,
are
one
the
most
promising
biobased
products.
In
this
study,
effects
acidic
(pH
5),
neutral
(without
pH
adjustment)
and
alkali
10)
on
production
efficiency
composition
volatile
acids
(VFAs)
bacterial
community
profile
were
analyzed.
The
sequencing
batch
reactors
fed
cheese
wastewater
as
substrate
inoculated
by
granular
seed
sludge.
results
showed
that
improved
VFA
yield
(0.92
at
5;
0.42
10
0.21
gCOD/gVS
pH).
Furthermore,
propionic
acid
was
dominant
under
both
(64
±
20%)
(72
8%),
whereas,
acetic
(23
20%4),
(22
3%),
butyric
(21
4%)
valeric
(15
8%)
almost
equally
distributed
5.
Adaptation
to
different
conditions
might
steer
profile:
Bacteroidetes
(50.07
2%)
10,
Proteobacteria
(40.74
7%)
Firmicutes
(47.64
9%)
5
phylum,
respectively.
Results
indicated
plays
a
significant
role
in
production,
composition,
structure.
However,
order
gain
concrete
understanding
pH,
characterization
intracellular
extracellular
metabolites
with
dynamics
microbial
is
required.
Fermentation,
Journal Year:
2022,
Volume and Issue:
8(7), P. 325 - 325
Published: July 11, 2022
Utilising
‘wastes’
as
‘resources’
is
key
to
a
circular
economy.
While
there
are
multiple
routes
waste
valorisation,
anaerobic
digestion
(AD)—a
biochemical
means
breakdown
organic
wastes
in
the
absence
of
oxygen—is
favoured
due
its
capacity
handle
variety
feedstocks.
Traditional
AD
focuses
on
production
biogas
and
fertiliser
products;
however,
such
low-value
products
combined
with
longer
residence
times
slow
kinetics
have
paved
way
explore
alternative
product
platforms.
The
intermediate
steps
conventional
AD—acidogenesis
acetogenesis—have
capability
produce
biohydrogen
volatile
fatty
acids
(VFA)
which
gaining
increased
attention
higher
energy
density
(than
biogas)
market
value,
respectively.
This
review
hence
focusses
specifically
VFAs
from
wastes.
With
revived
interest
these
products,
critical
analysis
recent
literature
needed
establish
current
status.
Therefore,
intensification
strategies
this
area
involving
three
main
streams:
substrate
pre-treatment,
parameters
recovery
discussed
detail
based
reported
last
decade.
techno-economic
aspects
future
pointers
clearly
highlighted
drive
research
forward
relevant
areas.
